IMAGE HISTOGRAM on MONO 16BBP vs MONO 8BBP (and MONO 12BBP) images . . .

mbatchelor

All --

In IPP904, the STATISTICS section of the IMAGE HISTOGRAM box for a MONO 16BBP image (with intensities from 0 to 53) generated by the DISTANCE MAP FILTER report includes:

Mean: 0
St.Dev.: 0
Min: 0
Max: 53
Sum: 0

The MEAN, ST.DEV., and SUM values here are not reasonable.

When a MONO 8BBP image (with intensities from 0 to 53) is generated from the MONO 16BBP image via

    ADJUST + CONVERT + APPLY with MONO 8BBP + DIRECT COPY PIXEL VALUES options

then the STATISTICS within the IMAGE HISTOGRAM reports

Mean: 12.093
St.Dev.: 12.126
Min: 0
Max: 53
Sum: 640858

The MEAN, ST.DEV., and SUM values here seem reasonable.

I have attached SCREEN CAPTURES showing this behavior.

I've poked at this a bit more and going from 16BBP to 12BBP generates an image that generates STATISTICS within IMAGE HISTOGRAM but they are different than the STATS for the 8BBP image (screen capture attached) even though the pixel values were supposed to be COPIED and not SCALED.

I've done the same thing within IPP7 and the results are that the IPP7 IMAGE HISTOGRAM STATS for 16BBP, 8BBP, and 12BBP versions of the image all match the IPP9 IMAGE HISTOGRAM STATS for the 8BBP version of the image (screen capture attached).

Is there a solution for this?

Thanks.

-- Matt

NikitaRG

Hi Matt,

Thank you for reporting this issue, will be fixed in 9.1.
On the current version you can use the following macro:

    Public Sub FixImageHistogram
        Dim img As McImage = ThisApplication.ActiveImage
        Dim hist As MediaCy.IQL.Operations.McHistogram, cont As Object

        If img IsNot Nothing Then
            hist = ThisApplication.CreateOperator("McHistogram", img, "ImageHistogram")
            hist.BinCount = hist.MaxBinCount

            cont = ThisApplication.Panels.Control("ImageHistogram")
            If cont IsNot Nothing Then
                cont.InitAndUpdate
            End If
        End If
    End Sub

mbatchelor

NikitaRG --

Thank you for the response and the MACRO to extract the information.  I'll integrate this into my APP ASAP.

Thank you also for your -E-X-T-R-E-M-E-L-Y- -H-E-L-P-F-U-L- code for accessing EXCEL from within an IPP9 APP.

-- Matt